Walter Medlin, Kissimmee's internationally known Ferrari collector, heads back to federal prison after another conviction for income tax evasion.

The Osceola County developer must serve 30 months after being sentenced Monday by Senior U.S. District Judge Gregory A. Presnell for evasion of about $1.1 million in taxes from selling a landfill for $7.5 million, according to the U.S. Attorney's Office in Orlando.

In addition to paying his back taxes with interest and penalties, Medlin, 71, will serve a year of probation upon his release.

Often described as reclusive and mysterious, Medlin has generated interest for decades in how the county's native-born financial wizard collected his collection of Ferraris through a series of land and business deals after graduating from Osceola High School and working as an X-ray technician.

In April 1970, police armed with a search warrant and a sealed grand jury indictment raided Medlin's former home and seized prescription medicine. Medlin was convicted on three counts of possession of amphetamines and barbiturates in April 1971. He was sentenced to two years in prison on one drug charge, according to more than 80 articles on Medlin's career by the Orlando Sentinel.

Two weeks after his conviction on the drug charges, an Osceola grand jury indicted Medlin on a charge of performing an abortion, which was illegal then. Evidence included surgical tools seized in the drug raid.

Medlin was eventually convicted on charges of performing illegal abortions but never sentenced. The state Supreme Court struck down the 104-year-old abortion law in February 1972, days before Medlin's sentencing.

Medlin made headlines in the 1970s when he owned the a now-defunct aviation museum housing a mock-up of the supersonic airliner Concorde on Aeronautical Drive. Now home to a Kissimmee church, the property was sold on the courthouse steps in January 1979 after Medlin failed to make payments on a $427,000 mortgage.

His disputes with the Internal Revenue Service date back to the 1970s and appeared to peak in 1990 when IRS agents seized two of his rare Ferrari race cars — then valued at up to $20 million — for failing to pay $540,000 in unpaid taxes.

But the battles continued for more than 20 years.

In 1997, Medlin served five months in prison for concealing three of his Ferrari sports cars during one of his IRS disputes.

"I made a mistake and I've paid for it — and I'm paying for it," Medlin told U.S. District Judge Anne Conway at the time.

In 2004, when Hurricane Charley blew by Medlin's lakefront Kissimmee home on West Lake Tohopekaliga, the destruction created a brief gawker attraction on nearby Kings Highway: the ruins of a metal barn holding 18 Ferraris and a Studebaker Avanti.

Years earlier, Medlin had invited automotive writer Bill Warner to take a look at the barn's contents that were estimated to be worth $50 million to $60 million. Within months of Hurricane Charley, the IRS filed a $3 million tax lien against him and seized a 1967 Ferrari 330 P4 valued at $10 million.

Shown a picture of the destroyed barn, Warner said it held different cars but estimated a Ferrari 275GTB and a Formula 1 race car in the wreckage might be worth $1.5 million. Days later, the vehicles were removed to an undisclosed location.

In 2005, as the IRS auction of the 12-cylinder race car was going to be held, Medlin paid the $3 million he had owed since the 1980s.

Never one to attract attention, Medlin dressed in ranch-hand casual style and didn't drive anything much fancier around Kissimmee than a red SUV.

"Walter Medlin has made a career out of people underestimating him," former Osceola County Commissioner Atlee Mercer told the Orlando Sentinel in 2005. "You can be standing next to him in a bar and you wouldn't know it was him."